linux-kernel - [PATCH] reset: warn on invalid input to reset_control

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Date:   Wed, 24 Aug 2016 15:33:47 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Arnd Bergmann <arnd@...db.de>,
        Hans de Goede <hdegoede@...hat.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH] reset: warn on invalid input to reset_control_reset/assert/deassert/status

Instead of potentially crashing, dump a backtrace and return -EINVAL if
rstc is NULL or an error code.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/reset/core.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 395dc9c..b8ae1db 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -138,7 +138,8 @@ EXPORT_SYMBOL_GPL(devm_reset_controller_register);
  */
 int reset_control_reset(struct reset_control *rstc)
 {
-	if (WARN_ON(rstc->shared))
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)) ||
+	    WARN_ON(rstc->shared))
 		return -EINVAL;
 
 	if (rstc->rcdev->ops->reset)
@@ -161,6 +162,9 @@ EXPORT_SYMBOL_GPL(reset_control_reset);
  */
 int reset_control_assert(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (!rstc->rcdev->ops->assert)
 		return -ENOTSUPP;
 
@@ -184,6 +188,9 @@ EXPORT_SYMBOL_GPL(reset_control_assert);
  */
 int reset_control_deassert(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (!rstc->rcdev->ops->deassert)
 		return -ENOTSUPP;
 
@@ -204,6 +211,9 @@ EXPORT_SYMBOL_GPL(reset_control_deassert);
  */
 int reset_control_status(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (rstc->rcdev->ops->status)
 		return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
 
-- 
2.8.1